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Kirill Smelkov
wendelin.core
Commits
e05f89b1
Commit
e05f89b1
authored
Mar 29, 2019
by
Kirill Smelkov
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parent
6559cefe
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2 changed files
with
62 additions
and
29 deletions
+62
-29
wcfs/wcfs.go
wcfs/wcfs.go
+61
-28
wcfs/wcfs_test.py
wcfs/wcfs_test.py
+1
-1
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wcfs/wcfs.go
View file @
e05f89b1
...
...
@@ -122,6 +122,7 @@
// clients, that had requested it (separately to each client), about the
// changes:
//
// XXX rev_max -> rev?
// S: 2 pin <bigfileX> #<blk> @<rev_max> XXX 2-> 2*k (multiple pins in parallel)
//
// and waits until all clients confirm that changed file block can be updated
...
...
@@ -503,16 +504,15 @@ type Watcher struct {
}
// FileWatch represents watching for 1 BigFile.
// XXX merge into watcher?
type
FileWatch
struct
{
link
*
Watcher
// link to client
file
*
BigFile
// XXX needed?
// XXX locking
// requested to be watched @at
at
zodb
.
Tid
// XXX pinned
at
zodb
.
Tid
// requested to be watched @at
pinned
SetI64
// blocks that are already pinned to be ≤ at
}
// /(head|<rev>)/bigfile/ - served by BigFileDir.
...
...
@@ -803,7 +803,7 @@ retry:
// fmt.Printf("\t- %s\n", file.zfile.POid())
//}
wg
,
ctx
:=
errgroup
.
WithContext
(
context
.
TODO
())
wg
,
ctx
:=
errgroup
.
WithContext
(
context
.
TODO
())
// XXX ctx = ?
for
file
,
finv
:=
range
toinvalidate
{
file
:=
file
for
blk
:=
range
finv
.
blkmap
{
...
...
@@ -822,7 +822,7 @@ retry:
// we need to do it only if we see topology (i.e. btree) change
//
// do it after completing data invalidations.
wg
,
ctx
=
errgroup
.
WithContext
(
context
.
TODO
())
wg
,
ctx
=
errgroup
.
WithContext
(
context
.
TODO
())
// XXX ctx = ?
for
file
,
finv
:=
range
toinvalidate
{
if
!
finv
.
size
{
continue
...
...
@@ -1096,7 +1096,8 @@ func (f *BigFile) readBlk(ctx context.Context, blk int64, dest []byte) (err erro
}
// we have the data - it can be used after watchers are updated
f
.
updateWatchers
(
blk
,
treepath
,
pathRevMax
)
// XXX should we use ctx here? (see updateWatcher comments)
f
.
updateWatchers
(
ctx
,
blk
,
treepath
,
pathRevMax
)
// data can be used now
close
(
loading
.
ready
)
...
...
@@ -1129,7 +1130,11 @@ func (f *BigFile) readBlk(ctx context.Context, blk int64, dest []byte) (err erro
// See "7.2) for all registered client@at watchers ..."
//
// Called with f.head.zconnMu rlocked.
func
(
f
*
BigFile
)
updateWatchers
(
blk
int64
,
treepath
[]
zodb
.
IPersistent
,
pathRevMax
zodb
.
Tid
)
{
//
// XXX do we really need to use/propagate caller contex here? ideally update
// watchers should be synchronous, and in practice we just use 30s timeout.
// Should a READ interrupt cause watch update failure?
func
(
f
*
BigFile
)
updateWatchers
(
ctx
context
.
Context
,
blk
int64
,
treepath
[]
zodb
.
IPersistent
,
pathRevMax
zodb
.
Tid
)
{
// only head/ is being watched for
if
f
.
head
.
rev
!=
0
{
return
...
...
@@ -1144,29 +1149,19 @@ func (f *BigFile) updateWatchers(blk int64, treepath []zodb.IPersistent, pathRev
blkrevmax
,
_
:=
f
.
δFtail
.
LastRevOf
(
blk
,
f
.
zfile
.
PJar
()
.
At
())
// XXX = f.head.zconn.At()
blkrevmax
=
tidmin
(
blkrevmax
,
pathRevMax
)
wg
,
ctx
:=
errgroup
.
WithContext
(
ctx
)
for
w
:=
range
f
.
watchers
{
w
:=
w
wg
.
Go
(
func
()
error
{
// XXX close watcher on any error
return
w
.
pin
(
ctx
,
blk
,
blkrevmax
)
})
_
=
w
}
/*
// XXX locking
for _, mapping := range f.mappings {
if revmax <= mapping.at || !mapping.blkrange.in(blk) {
continue // do nothing
}
if mapping.pinned.Contains(blk) {
continue // do nothing
}
rev = max(δFtail.by(blk) : _ <= mapping.at)
// XXX vvv -> go
client.remmap(mapping.addr[blk], file/@<rev>/data)
mapping.pinned.Add(blk)
err
:=
wg
.
Wait
()
if
err
!=
nil
{
panic
(
err
)
// XXX
}
*/
}
// uploadBlk complements readBlk: it uploads loaded blkdata into OS cache.
...
...
@@ -1240,7 +1235,45 @@ retry:
// -------- notifications to Watcher --------
// XXX WatchFile.Pin(blk, at)
// pin makes sure that file[blk] on client side is the same as of @rev state.
//
// XXX describe more.
// XXX explain that if rev ≤ .at there is no rev_next: rev < rev_next ≤ at.
// XXX error - when?
//
// XXX -> WatchFile.Pin(blk, at)
// XXX place=ok?
func
(
w
*
FileWatch
)
pin
(
ctx
context
.
Context
,
blk
int64
,
rev
zodb
.
Tid
)
(
err
error
)
{
foid
:=
w
.
file
.
zfile
.
POid
()
defer
xerr
.
Contextf
(
&
err
,
"f<%s>: watch%d: pin #blk @%s"
,
foid
,
w
.
link
.
id
,
blk
,
rev
)
// XXX locking?
// XXX simultaneous calls?
if
rev
<=
w
.
at
{
return
// client's view already coveris rev
}
if
w
.
pinned
.
Has
(
blk
)
{
// XXX pinned has to be invalidated when w.at^
return
// already pinned
}
// XXX comment
rev
,
_
=
w
.
file
.
δFtail
.
LastRevOf
(
blk
,
w
.
at
)
ack
,
err
:=
w
.
link
.
send
(
ctx
,
fmt
.
Sprintf
(
"pin %s #%s @%s"
,
foid
,
blk
,
rev
))
if
err
!=
nil
{
return
err
}
if
ack
!=
"ack"
{
return
fmt
.
Errorf
(
"expect %q; got %q"
,
"ack"
,
ack
)
}
w
.
pinned
.
Add
(
blk
)
return
nil
}
// ---- Watch server ----
...
...
wcfs/wcfs_test.py
View file @
e05f89b1
...
...
@@ -479,7 +479,7 @@ class tWatch:
reqv
=
[]
# of received requests
while
len
(
expected
)
>
0
:
req
=
t
.
recvReq
()
assert
req
is
not
None
assert
req
is
not
None
# channel not closed
assert
req
.
msg
in
expected
expected
.
delete
(
req
.
msg
)
reqv
.
append
(
req
)
...
...
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